/**
 * Copyright 2017 Confluent Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

package io.confluent.ksql.parser.tree;

import io.confluent.ksql.parser.ParsingException;

import java.util.Objects;
import java.util.Optional;

import static java.util.Objects.requireNonNull;

public final class GenericLiteral
    extends Literal {

  private final String type;
  private final String value;

  public GenericLiteral(String type, String value) {
    this(Optional.empty(), type, value);
  }

  public GenericLiteral(NodeLocation location, String type, String value) {
    this(Optional.of(location), type, value);
  }

  private GenericLiteral(Optional<NodeLocation> location, String type, String value) {
    super(location);
    requireNonNull(type, "type is null");
    requireNonNull(value, "value is null");
    if (type.equalsIgnoreCase("X")) {
      // we explicitly disallow "X" as type name, so if the user arrived here,
      // it must be because that he intended to give a binaryLiteral instead, but
      // added whitespace between the X and quote
      throw new ParsingException(
          "Spaces are not allowed between 'X' and the starting quote of a binary literal",
          location.get());
    }
    this.type = type;
    this.value = value;
  }

  public String getType() {
    return type;
  }

  public String getValue() {
    return value;
  }

  @Override
  public <R, C> R accept(AstVisitor<R, C> visitor, C context) {
    return visitor.visitGenericLiteral(this, context);
  }

  @Override
  public int hashCode() {
    return Objects.hash(value, type);
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }

    GenericLiteral other = (GenericLiteral) obj;
    return Objects.equals(this.value, other.value)
           && Objects.equals(this.type, other.type);
  }
}
